This study incorporates pressure data in the Winterburn to Jean Marie interval within an area extending from T. 85, R. 13W5M in Alberta to Block L/94-O-15 in B.C.

The objectives were to:

• Define the approximate eastern and southern play extents of the Jean Marie within the study area.
• Determine whether the Jean Marie gas-saturated trend is in pressure communication with the wet Winterburn trend, and if so, define updip and downdip water lines.
• Define pressure trends and potential for reservoir continuity within the Jean Marie play.

Based on this analysis, the Jean Marie regional low-permeability gas system and the Winterburn-Kakisa aquifer system do not appear to be in pressure communication, and therefore can be mapped as separate hydrostratigraphic units. Isolation of the Jean Marie gas system from the aquifer system indicates that underpressuring is not a result of gas leakage into the aquifer system. Formation pressures in this area vary from a maximum of approximately 15,000 kPa to a low of approximately 5,000 kPa. Rapid pressure variances of 400 kPa to over 2,400 kPa are observed over short distances throughout the play trend. We believe these pressure systems to be facies-related, but more detailed geologic and hydrodynamic work is required to predict and confirm these trends. The Jean Marie play is limited to the west, south, and east by reservoir quality. Northern play limits were not identified, and reservoir de-pressuring may be related to facies changes in that direction. Gas production may be limited by the presence of oil in the system.